Update OpenGL version to 4.6 in Ubuntu 18.04

I have problem related my nvidia driver in Ubuntu 18.04. Actually the problem occurred in computer server and I remote the computer server by using X2Go.

My Computer Server using Ubuntu 18.04 And using NVIDIA Geforce GTX 1080 TI

I am using the method to install Nvidia Drivers from this:

And actually it installed the latest driver as I am check using nvidia-smi: wheras showing I am using driver 440.26 which means the latest driver and my Mesa Version is 19.3.

But when I check my openGL using glxinfo | grep ':' it showing that my openGL version is 3.1 which is not latest update. I really need to upgrade my openGL version to 4.6. Here, is my OpenGL version

OpenGL version string: 3.1 Mesa 19.3.0-devel (git-ff6e148 2019-10-29 bionic-oibaf-ppa)

I am struggle for hours to do this but I can't. Could someone tell me how to proceed please?

Thank you to help me.

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